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Finding the Fourth Proportional to 740.16, 1,021.43 and 425.47

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Solution

The fourth proportional to 740.16, 1,021.43 and 425.47 is: 587.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.16 : 1,021.43 = 425.47 : x
  2. Step 2: Convert to fraction form
    740.16/1,021.43 = 425.47/x
  3. Step 3: Cross multiply
    740.16x = 1,021.43 × 425.47
  4. Step 4: Simplify right side
    740.16x = 434,587.82
  5. Step 5: Solve for x
    x = 434,587.82/740.16
  6. Step 6: Final answer
    x = 587.15

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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.