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Finding the Fourth Proportional to 128,657.28, 177,547.10 and 78,356.28

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Solution

The fourth proportional to 128,657.28, 177,547.10 and 78,356.28 is: 108,131.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,657.28 : 177,547.10 = 78,356.28 : x
  2. Step 2: Convert to fraction form
    128,657.28/177,547.10 = 78,356.28/x
  3. Step 3: Cross multiply
    128,657.28x = 177,547.10 × 78,356.28
  4. Step 4: Simplify right side
    128,657.28x = 13,911,930,280.79
  5. Step 5: Solve for x
    x = 13,911,930,280.79/128,657.28
  6. Step 6: Final answer
    x = 108,131.70

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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.