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Finding the Fourth Proportional to 898.16, 1,239.48 and 505.15

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Solution

The fourth proportional to 898.16, 1,239.48 and 505.15 is: 697.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.16 : 1,239.48 = 505.15 : x
  2. Step 2: Convert to fraction form
    898.16/1,239.48 = 505.15/x
  3. Step 3: Cross multiply
    898.16x = 1,239.48 × 505.15
  4. Step 4: Simplify right side
    898.16x = 626,120.22
  5. Step 5: Solve for x
    x = 626,120.22/898.16
  6. Step 6: Final answer
    x = 697.12

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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.