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Finding the Fourth Proportional to 925.65, 1,386.45 and 559.80

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Solution

The fourth proportional to 925.65, 1,386.45 and 559.80 is: 838.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.65 : 1,386.45 = 559.80 : x
  2. Step 2: Convert to fraction form
    925.65/1,386.45 = 559.80/x
  3. Step 3: Cross multiply
    925.65x = 1,386.45 × 559.80
  4. Step 4: Simplify right side
    925.65x = 776,134.71
  5. Step 5: Solve for x
    x = 776,134.71/925.65
  6. Step 6: Final answer
    x = 838.48

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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.