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Finding the Fourth Proportional to 900.73, 1,242.99 and 507.75

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Solution

The fourth proportional to 900.73, 1,242.99 and 507.75 is: 700.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.73 : 1,242.99 = 507.75 : x
  2. Step 2: Convert to fraction form
    900.73/1,242.99 = 507.75/x
  3. Step 3: Cross multiply
    900.73x = 1,242.99 × 507.75
  4. Step 4: Simplify right side
    900.73x = 631,132.57
  5. Step 5: Solve for x
    x = 631,132.57/900.73
  6. Step 6: Final answer
    x = 700.69

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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.