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Finding the Fourth Proportional to 666.78, 924.36 and 631.65

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Solution

The fourth proportional to 666.78, 924.36 and 631.65 is: 875.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.78 : 924.36 = 631.65 : x
  2. Step 2: Convert to fraction form
    666.78/924.36 = 631.65/x
  3. Step 3: Cross multiply
    666.78x = 924.36 × 631.65
  4. Step 4: Simplify right side
    666.78x = 583,871.99
  5. Step 5: Solve for x
    x = 583,871.99/666.78
  6. Step 6: Final answer
    x = 875.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.