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Finding the Fourth Proportional to 702.30, 1,053.45 and 661.80

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Solution

The fourth proportional to 702.30, 1,053.45 and 661.80 is: 992.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.30 : 1,053.45 = 661.80 : x
  2. Step 2: Convert to fraction form
    702.30/1,053.45 = 661.80/x
  3. Step 3: Cross multiply
    702.30x = 1,053.45 × 661.80
  4. Step 4: Simplify right side
    702.30x = 697,173.21
  5. Step 5: Solve for x
    x = 697,173.21/702.30
  6. Step 6: Final answer
    x = 992.70

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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.