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Finding the Fourth Proportional to 747.99, 1,121.06 and 260.47

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Solution

The fourth proportional to 747.99, 1,121.06 and 260.47 is: 390.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.99 : 1,121.06 = 260.47 : x
  2. Step 2: Convert to fraction form
    747.99/1,121.06 = 260.47/x
  3. Step 3: Cross multiply
    747.99x = 1,121.06 × 260.47
  4. Step 4: Simplify right side
    747.99x = 292,002.50
  5. Step 5: Solve for x
    x = 292,002.50/747.99
  6. Step 6: Final answer
    x = 390.38

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1.5x scale

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.