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Finding the Fourth Proportional to 1,030.70, 1,420.75 and 781.02

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Solution

The fourth proportional to 1,030.70, 1,420.75 and 781.02 is: 1,076.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.70 : 1,420.75 = 781.02 : x
  2. Step 2: Convert to fraction form
    1,030.70/1,420.75 = 781.02/x
  3. Step 3: Cross multiply
    1,030.70x = 1,420.75 × 781.02
  4. Step 4: Simplify right side
    1,030.70x = 1,109,634.17
  5. Step 5: Solve for x
    x = 1,109,634.17/1,030.70
  6. Step 6: Final answer
    x = 1,076.58

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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.