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Finding the Fourth Proportional to 1,005.62, 1,387.90 and 612.76

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Solution

The fourth proportional to 1,005.62, 1,387.90 and 612.76 is: 845.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.62 : 1,387.90 = 612.76 : x
  2. Step 2: Convert to fraction form
    1,005.62/1,387.90 = 612.76/x
  3. Step 3: Cross multiply
    1,005.62x = 1,387.90 × 612.76
  4. Step 4: Simplify right side
    1,005.62x = 850,449.60
  5. Step 5: Solve for x
    x = 850,449.60/1,005.62
  6. Step 6: Final answer
    x = 845.70

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1.5x scale

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.