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Finding the Fourth Proportional to 917.50, 1,376.45 and 430.29

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Solution

The fourth proportional to 917.50, 1,376.45 and 430.29 is: 645.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.50 : 1,376.45 = 430.29 : x
  2. Step 2: Convert to fraction form
    917.50/1,376.45 = 430.29/x
  3. Step 3: Cross multiply
    917.50x = 1,376.45 × 430.29
  4. Step 4: Simplify right side
    917.50x = 592,272.67
  5. Step 5: Solve for x
    x = 592,272.67/917.50
  6. Step 6: Final answer
    x = 645.53

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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.