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Finding the Fourth Proportional to 657,138.70, 985,708.05 and 342,210.70

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Solution

The fourth proportional to 657,138.70, 985,708.05 and 342,210.70 is: 513,316.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,138.70 : 985,708.05 = 342,210.70 : x
  2. Step 2: Convert to fraction form
    657,138.70/985,708.05 = 342,210.70/x
  3. Step 3: Cross multiply
    657,138.70x = 985,708.05 × 342,210.70
  4. Step 4: Simplify right side
    657,138.70x = 337,319,841,786.14
  5. Step 5: Solve for x
    x = 337,319,841,786.14/657,138.70
  6. Step 6: Final answer
    x = 513,316.05

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.