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Finding the Fourth Proportional to 78,998.66, 108,953.19 and 56,330.40

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Solution

The fourth proportional to 78,998.66, 108,953.19 and 56,330.40 is: 77,689.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,998.66 : 108,953.19 = 56,330.40 : x
  2. Step 2: Convert to fraction form
    78,998.66/108,953.19 = 56,330.40/x
  3. Step 3: Cross multiply
    78,998.66x = 108,953.19 × 56,330.40
  4. Step 4: Simplify right side
    78,998.66x = 6,137,376,773.98
  5. Step 5: Solve for x
    x = 6,137,376,773.98/78,998.66
  6. Step 6: Final answer
    x = 77,689.64

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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.