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Finding the Fourth Proportional to 128,607, 177,477.75 and 72,019.68

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Solution

The fourth proportional to 128,607, 177,477.75 and 72,019.68 is: 99,387.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,607 : 177,477.75 = 72,019.68 : x
  2. Step 2: Convert to fraction form
    128,607/177,477.75 = 72,019.68/x
  3. Step 3: Cross multiply
    128,607x = 177,477.75 × 72,019.68
  4. Step 4: Simplify right side
    128,607x = 12,781,890,762.12
  5. Step 5: Solve for x
    x = 12,781,890,762.12/128,607
  6. Step 6: Final answer
    x = 99,387.21

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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.