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Finding the Fourth Proportional to 128,646.16, 177,526.56 and 72,054.64

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Solution

The fourth proportional to 128,646.16, 177,526.56 and 72,054.64 is: 99,432.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,646.16 : 177,526.56 = 72,054.64 : x
  2. Step 2: Convert to fraction form
    128,646.16/177,526.56 = 72,054.64/x
  3. Step 3: Cross multiply
    128,646.16x = 177,526.56 × 72,054.64
  4. Step 4: Simplify right side
    128,646.16x = 12,791,612,371.24
  5. Step 5: Solve for x
    x = 12,791,612,371.24/128,646.16
  6. Step 6: Final answer
    x = 99,432.52

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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.