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Finding the Fourth Proportional to 784.23, 1,079.50 and 710.42

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Solution

The fourth proportional to 784.23, 1,079.50 and 710.42 is: 977.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.23 : 1,079.50 = 710.42 : x
  2. Step 2: Convert to fraction form
    784.23/1,079.50 = 710.42/x
  3. Step 3: Cross multiply
    784.23x = 1,079.50 × 710.42
  4. Step 4: Simplify right side
    784.23x = 766,894.84
  5. Step 5: Solve for x
    x = 766,894.84/784.23
  6. Step 6: Final answer
    x = 977.90

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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.