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Finding the Fourth Proportional to 818.37, 1,129.08 and 486.75

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Solution

The fourth proportional to 818.37, 1,129.08 and 486.75 is: 671.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.37 : 1,129.08 = 486.75 : x
  2. Step 2: Convert to fraction form
    818.37/1,129.08 = 486.75/x
  3. Step 3: Cross multiply
    818.37x = 1,129.08 × 486.75
  4. Step 4: Simplify right side
    818.37x = 549,579.69
  5. Step 5: Solve for x
    x = 549,579.69/818.37
  6. Step 6: Final answer
    x = 671.55

Related Problems

Find fourth proportional to 409.19, 564.54 and 243.38
Half scale
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Double scale
Find fourth proportional to 819.37, 1,130.46 and 487.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.