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Finding the Fourth Proportional to 875.14, 1,312.80 and 442.24

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Solution

The fourth proportional to 875.14, 1,312.80 and 442.24 is: 663.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.14 : 1,312.80 = 442.24 : x
  2. Step 2: Convert to fraction form
    875.14/1,312.80 = 442.24/x
  3. Step 3: Cross multiply
    875.14x = 1,312.80 × 442.24
  4. Step 4: Simplify right side
    875.14x = 580,572.67
  5. Step 5: Solve for x
    x = 580,572.67/875.14
  6. Step 6: Final answer
    x = 663.41

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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.