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Finding the Fourth Proportional to 900.60, 1,242.90 and 507.66

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Solution

The fourth proportional to 900.60, 1,242.90 and 507.66 is: 700.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.60 : 1,242.90 = 507.66 : x
  2. Step 2: Convert to fraction form
    900.60/1,242.90 = 507.66/x
  3. Step 3: Cross multiply
    900.60x = 1,242.90 × 507.66
  4. Step 4: Simplify right side
    900.60x = 630,970.61
  5. Step 5: Solve for x
    x = 630,970.61/900.60
  6. Step 6: Final answer
    x = 700.61

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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.