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Finding the Fourth Proportional to 905.74, 1,249.87 and 507.40

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Solution

The fourth proportional to 905.74, 1,249.87 and 507.40 is: 700.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.74 : 1,249.87 = 507.40 : x
  2. Step 2: Convert to fraction form
    905.74/1,249.87 = 507.40/x
  3. Step 3: Cross multiply
    905.74x = 1,249.87 × 507.40
  4. Step 4: Simplify right side
    905.74x = 634,184.04
  5. Step 5: Solve for x
    x = 634,184.04/905.74
  6. Step 6: Final answer
    x = 700.18

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1.5x scale

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.