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Finding the Fourth Proportional to 975.50, 1,463.25 and 390.55

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Solution

The fourth proportional to 975.50, 1,463.25 and 390.55 is: 585.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.50 : 1,463.25 = 390.55 : x
  2. Step 2: Convert to fraction form
    975.50/1,463.25 = 390.55/x
  3. Step 3: Cross multiply
    975.50x = 1,463.25 × 390.55
  4. Step 4: Simplify right side
    975.50x = 571,470.23
  5. Step 5: Solve for x
    x = 571,470.23/975.50
  6. Step 6: Final answer
    x = 585.82

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Double scale
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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.