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Finding the Fourth Proportional to 970.34, 1,454.43 and 421.70

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Solution

The fourth proportional to 970.34, 1,454.43 and 421.70 is: 632.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.34 : 1,454.43 = 421.70 : x
  2. Step 2: Convert to fraction form
    970.34/1,454.43 = 421.70/x
  3. Step 3: Cross multiply
    970.34x = 1,454.43 × 421.70
  4. Step 4: Simplify right side
    970.34x = 613,333.13
  5. Step 5: Solve for x
    x = 613,333.13/970.34
  6. Step 6: Final answer
    x = 632.08

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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.