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Finding the Fourth Proportional to 1,152.61, 1,590.60 and 628.63

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Solution

The fourth proportional to 1,152.61, 1,590.60 and 628.63 is: 867.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.61 : 1,590.60 = 628.63 : x
  2. Step 2: Convert to fraction form
    1,152.61/1,590.60 = 628.63/x
  3. Step 3: Cross multiply
    1,152.61x = 1,590.60 × 628.63
  4. Step 4: Simplify right side
    1,152.61x = 999,898.88
  5. Step 5: Solve for x
    x = 999,898.88/1,152.61
  6. Step 6: Final answer
    x = 867.51

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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.