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Finding the Fourth Proportional to 909.20, 1,254.77 and 510.90

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Solution

The fourth proportional to 909.20, 1,254.77 and 510.90 is: 705.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.20 : 1,254.77 = 510.90 : x
  2. Step 2: Convert to fraction form
    909.20/1,254.77 = 510.90/x
  3. Step 3: Cross multiply
    909.20x = 1,254.77 × 510.90
  4. Step 4: Simplify right side
    909.20x = 641,061.99
  5. Step 5: Solve for x
    x = 641,061.99/909.20
  6. Step 6: Final answer
    x = 705.08

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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.