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Finding the Fourth Proportional to 1,152.31, 1,590.20 and 628.35

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Solution

The fourth proportional to 1,152.31, 1,590.20 and 628.35 is: 867.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.31 : 1,590.20 = 628.35 : x
  2. Step 2: Convert to fraction form
    1,152.31/1,590.20 = 628.35/x
  3. Step 3: Cross multiply
    1,152.31x = 1,590.20 × 628.35
  4. Step 4: Simplify right side
    1,152.31x = 999,202.17
  5. Step 5: Solve for x
    x = 999,202.17/1,152.31
  6. Step 6: Final answer
    x = 867.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.