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Finding the Fourth Proportional to 818.78, 1,137.67 and 810.22

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Solution

The fourth proportional to 818.78, 1,137.67 and 810.22 is: 1,125.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.78 : 1,137.67 = 810.22 : x
  2. Step 2: Convert to fraction form
    818.78/1,137.67 = 810.22/x
  3. Step 3: Cross multiply
    818.78x = 1,137.67 × 810.22
  4. Step 4: Simplify right side
    818.78x = 921,762.99
  5. Step 5: Solve for x
    x = 921,762.99/818.78
  6. Step 6: Final answer
    x = 1,125.78

Related Problems

Find fourth proportional to 409.39, 568.84 and 405.11
Half scale
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Double scale
Find fourth proportional to 819.78, 1,139.06 and 811.22
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.