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Finding the Fourth Proportional to 78,542.40, 117,554.40 and 60,916.80

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Solution

The fourth proportional to 78,542.40, 117,554.40 and 60,916.80 is: 91,174.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,542.40 : 117,554.40 = 60,916.80 : x
  2. Step 2: Convert to fraction form
    78,542.40/117,554.40 = 60,916.80/x
  3. Step 3: Cross multiply
    78,542.40x = 117,554.40 × 60,916.80
  4. Step 4: Simplify right side
    78,542.40x = 7,161,037,873.92
  5. Step 5: Solve for x
    x = 7,161,037,873.92/78,542.40
  6. Step 6: Final answer
    x = 91,174.17

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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.