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Finding the Fourth Proportional to 698.47, 1,047.69 and 374.47

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Solution

The fourth proportional to 698.47, 1,047.69 and 374.47 is: 561.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.47 : 1,047.69 = 374.47 : x
  2. Step 2: Convert to fraction form
    698.47/1,047.69 = 374.47/x
  3. Step 3: Cross multiply
    698.47x = 1,047.69 × 374.47
  4. Step 4: Simplify right side
    698.47x = 392,328.47
  5. Step 5: Solve for x
    x = 392,328.47/698.47
  6. Step 6: Final answer
    x = 561.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.