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Finding the Fourth Proportional to 840.89, 1,160.58 and 486.76

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Solution

The fourth proportional to 840.89, 1,160.58 and 486.76 is: 671.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.89 : 1,160.58 = 486.76 : x
  2. Step 2: Convert to fraction form
    840.89/1,160.58 = 486.76/x
  3. Step 3: Cross multiply
    840.89x = 1,160.58 × 486.76
  4. Step 4: Simplify right side
    840.89x = 564,922.28
  5. Step 5: Solve for x
    x = 564,922.28/840.89
  6. Step 6: Final answer
    x = 671.81

Related Problems

Find fourth proportional to 420.45, 580.29 and 243.38
Half scale
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Double scale
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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.