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Finding the Fourth Proportional to 900.72, 1,242.90 and 507.60

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Solution

The fourth proportional to 900.72, 1,242.90 and 507.60 is: 700.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.72 : 1,242.90 = 507.60 : x
  2. Step 2: Convert to fraction form
    900.72/1,242.90 = 507.60/x
  3. Step 3: Cross multiply
    900.72x = 1,242.90 × 507.60
  4. Step 4: Simplify right side
    900.72x = 630,896.04
  5. Step 5: Solve for x
    x = 630,896.04/900.72
  6. Step 6: Final answer
    x = 700.44

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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.