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Finding the Fourth Proportional to 784.74, 1,178.38 and 647.50

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Solution

The fourth proportional to 784.74, 1,178.38 and 647.50 is: 972.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.74 : 1,178.38 = 647.50 : x
  2. Step 2: Convert to fraction form
    784.74/1,178.38 = 647.50/x
  3. Step 3: Cross multiply
    784.74x = 1,178.38 × 647.50
  4. Step 4: Simplify right side
    784.74x = 763,001.05
  5. Step 5: Solve for x
    x = 763,001.05/784.74
  6. Step 6: Final answer
    x = 972.30

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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.