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Finding the Fourth Proportional to 875.60, 1,312.20 and 713.60

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Solution

The fourth proportional to 875.60, 1,312.20 and 713.60 is: 1,069.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.60 : 1,312.20 = 713.60 : x
  2. Step 2: Convert to fraction form
    875.60/1,312.20 = 713.60/x
  3. Step 3: Cross multiply
    875.60x = 1,312.20 × 713.60
  4. Step 4: Simplify right side
    875.60x = 936,385.92
  5. Step 5: Solve for x
    x = 936,385.92/875.60
  6. Step 6: Final answer
    x = 1,069.42

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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.