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Finding the Fourth Proportional to 873.03, 1,302.78 and 781.02

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Solution

The fourth proportional to 873.03, 1,302.78 and 781.02 is: 1,165.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.03 : 1,302.78 = 781.02 : x
  2. Step 2: Convert to fraction form
    873.03/1,302.78 = 781.02/x
  3. Step 3: Cross multiply
    873.03x = 1,302.78 × 781.02
  4. Step 4: Simplify right side
    873.03x = 1,017,497.24
  5. Step 5: Solve for x
    x = 1,017,497.24/873.03
  6. Step 6: Final answer
    x = 1,165.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.