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Finding the Fourth Proportional to 972.21, 1,341.64 and 530.11

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Solution

The fourth proportional to 972.21, 1,341.64 and 530.11 is: 731.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.21 : 1,341.64 = 530.11 : x
  2. Step 2: Convert to fraction form
    972.21/1,341.64 = 530.11/x
  3. Step 3: Cross multiply
    972.21x = 1,341.64 × 530.11
  4. Step 4: Simplify right side
    972.21x = 711,213.43
  5. Step 5: Solve for x
    x = 711,213.43/972.21
  6. Step 6: Final answer
    x = 731.55

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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.