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Finding the Fourth Proportional to 78,371.80, 117,557.70 and 77,934.40

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Solution

The fourth proportional to 78,371.80, 117,557.70 and 77,934.40 is: 116,901.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,371.80 : 117,557.70 = 77,934.40 : x
  2. Step 2: Convert to fraction form
    78,371.80/117,557.70 = 77,934.40/x
  3. Step 3: Cross multiply
    78,371.80x = 117,557.70 × 77,934.40
  4. Step 4: Simplify right side
    78,371.80x = 9,161,788,814.88
  5. Step 5: Solve for x
    x = 9,161,788,814.88/78,371.80
  6. Step 6: Final answer
    x = 116,901.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.