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Finding the Fourth Proportional to 917.99, 1,266.80 and 525.01

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Solution

The fourth proportional to 917.99, 1,266.80 and 525.01 is: 724.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.99 : 1,266.80 = 525.01 : x
  2. Step 2: Convert to fraction form
    917.99/1,266.80 = 525.01/x
  3. Step 3: Cross multiply
    917.99x = 1,266.80 × 525.01
  4. Step 4: Simplify right side
    917.99x = 665,073.71
  5. Step 5: Solve for x
    x = 665,073.71/917.99
  6. Step 6: Final answer
    x = 724.49

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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.