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Finding the Fourth Proportional to 747, 1,031.47 and 647.78

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Solution

The fourth proportional to 747, 1,031.47 and 647.78 is: 894.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    747 : 1,031.47 = 647.78 : x
  2. Step 2: Convert to fraction form
    747/1,031.47 = 647.78/x
  3. Step 3: Cross multiply
    747x = 1,031.47 × 647.78
  4. Step 4: Simplify right side
    747x = 668,158.86
  5. Step 5: Solve for x
    x = 668,158.86/747
  6. Step 6: Final answer
    x = 894.46

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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.