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Finding the Fourth Proportional to 128,447.71, 177,255 and 70,304.15

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Solution

The fourth proportional to 128,447.71, 177,255 and 70,304.15 is: 97,018.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,447.71 : 177,255 = 70,304.15 : x
  2. Step 2: Convert to fraction form
    128,447.71/177,255 = 70,304.15/x
  3. Step 3: Cross multiply
    128,447.71x = 177,255 × 70,304.15
  4. Step 4: Simplify right side
    128,447.71x = 12,461,762,551.39
  5. Step 5: Solve for x
    x = 12,461,762,551.39/128,447.71
  6. Step 6: Final answer
    x = 97,018.18

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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.