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Finding the Fourth Proportional to 925.76, 1,390.56 and 579.50

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Solution

The fourth proportional to 925.76, 1,390.56 and 579.50 is: 870.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.76 : 1,390.56 = 579.50 : x
  2. Step 2: Convert to fraction form
    925.76/1,390.56 = 579.50/x
  3. Step 3: Cross multiply
    925.76x = 1,390.56 × 579.50
  4. Step 4: Simplify right side
    925.76x = 805,829.52
  5. Step 5: Solve for x
    x = 805,829.52/925.76
  6. Step 6: Final answer
    x = 870.45

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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.