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Finding the Fourth Proportional to 1,047.90, 1,573.08 and 831.63

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Solution

The fourth proportional to 1,047.90, 1,573.08 and 831.63 is: 1,248.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.90 : 1,573.08 = 831.63 : x
  2. Step 2: Convert to fraction form
    1,047.90/1,573.08 = 831.63/x
  3. Step 3: Cross multiply
    1,047.90x = 1,573.08 × 831.63
  4. Step 4: Simplify right side
    1,047.90x = 1,308,220.52
  5. Step 5: Solve for x
    x = 1,308,220.52/1,047.90
  6. Step 6: Final answer
    x = 1,248.42

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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.