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Finding the Fourth Proportional to 898.60, 1,240.10 and 505.52

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Solution

The fourth proportional to 898.60, 1,240.10 and 505.52 is: 697.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.60 : 1,240.10 = 505.52 : x
  2. Step 2: Convert to fraction form
    898.60/1,240.10 = 505.52/x
  3. Step 3: Cross multiply
    898.60x = 1,240.10 × 505.52
  4. Step 4: Simplify right side
    898.60x = 626,895.35
  5. Step 5: Solve for x
    x = 626,895.35/898.60
  6. Step 6: Final answer
    x = 697.64

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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.