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Finding the Fourth Proportional to 1,048.34, 1,572.33 and 390.53

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Solution

The fourth proportional to 1,048.34, 1,572.33 and 390.53 is: 585.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.34 : 1,572.33 = 390.53 : x
  2. Step 2: Convert to fraction form
    1,048.34/1,572.33 = 390.53/x
  3. Step 3: Cross multiply
    1,048.34x = 1,572.33 × 390.53
  4. Step 4: Simplify right side
    1,048.34x = 614,034.17
  5. Step 5: Solve for x
    x = 614,034.17/1,048.34
  6. Step 6: Final answer
    x = 585.72

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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.