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Finding the Fourth Proportional to 128,767.38, 177,699.40 and 71,410.80

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Solution

The fourth proportional to 128,767.38, 177,699.40 and 71,410.80 is: 98,547.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,767.38 : 177,699.40 = 71,410.80 : x
  2. Step 2: Convert to fraction form
    128,767.38/177,699.40 = 71,410.80/x
  3. Step 3: Cross multiply
    128,767.38x = 177,699.40 × 71,410.80
  4. Step 4: Simplify right side
    128,767.38x = 12,689,656,313.52
  5. Step 5: Solve for x
    x = 12,689,656,313.52/128,767.38
  6. Step 6: Final answer
    x = 98,547.13

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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.