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Finding the Fourth Proportional to 672.74, 928.76 and 515.07

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Solution

The fourth proportional to 672.74, 928.76 and 515.07 is: 711.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.74 : 928.76 = 515.07 : x
  2. Step 2: Convert to fraction form
    672.74/928.76 = 515.07/x
  3. Step 3: Cross multiply
    672.74x = 928.76 × 515.07
  4. Step 4: Simplify right side
    672.74x = 478,376.41
  5. Step 5: Solve for x
    x = 478,376.41/672.74
  6. Step 6: Final answer
    x = 711.09

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1.5x scale

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.