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Finding the Fourth Proportional to 972.90, 1,342.59 and 530.79

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Solution

The fourth proportional to 972.90, 1,342.59 and 530.79 is: 732.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.90 : 1,342.59 = 530.79 : x
  2. Step 2: Convert to fraction form
    972.90/1,342.59 = 530.79/x
  3. Step 3: Cross multiply
    972.90x = 1,342.59 × 530.79
  4. Step 4: Simplify right side
    972.90x = 712,636.86
  5. Step 5: Solve for x
    x = 712,636.86/972.90
  6. Step 6: Final answer
    x = 732.49

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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.