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Finding the Fourth Proportional to 900.71, 1,242.91 and 507.66

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Solution

The fourth proportional to 900.71, 1,242.91 and 507.66 is: 700.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.71 : 1,242.91 = 507.66 : x
  2. Step 2: Convert to fraction form
    900.71/1,242.91 = 507.66/x
  3. Step 3: Cross multiply
    900.71x = 1,242.91 × 507.66
  4. Step 4: Simplify right side
    900.71x = 630,975.69
  5. Step 5: Solve for x
    x = 630,975.69/900.71
  6. Step 6: Final answer
    x = 700.53

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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.