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Finding the Fourth Proportional to 88,397.40, 121,981.62 and 56,129.64

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Solution

The fourth proportional to 88,397.40, 121,981.62 and 56,129.64 is: 77,454.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,397.40 : 121,981.62 = 56,129.64 : x
  2. Step 2: Convert to fraction form
    88,397.40/121,981.62 = 56,129.64/x
  3. Step 3: Cross multiply
    88,397.40x = 121,981.62 × 56,129.64
  4. Step 4: Simplify right side
    88,397.40x = 6,846,784,417.22
  5. Step 5: Solve for x
    x = 6,846,784,417.22/88,397.40
  6. Step 6: Final answer
    x = 77,454.59

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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.