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Finding the Fourth Proportional to 77,792.80, 116,689.20 and 28,538.40

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Solution

The fourth proportional to 77,792.80, 116,689.20 and 28,538.40 is: 42,807.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,792.80 : 116,689.20 = 28,538.40 : x
  2. Step 2: Convert to fraction form
    77,792.80/116,689.20 = 28,538.40/x
  3. Step 3: Cross multiply
    77,792.80x = 116,689.20 × 28,538.40
  4. Step 4: Simplify right side
    77,792.80x = 3,330,123,065.28
  5. Step 5: Solve for x
    x = 3,330,123,065.28/77,792.80
  6. Step 6: Final answer
    x = 42,807.60

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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.