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Finding the Fourth Proportional to 665.01, 917.28 and 402.75

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Solution

The fourth proportional to 665.01, 917.28 and 402.75 is: 555.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.01 : 917.28 = 402.75 : x
  2. Step 2: Convert to fraction form
    665.01/917.28 = 402.75/x
  3. Step 3: Cross multiply
    665.01x = 917.28 × 402.75
  4. Step 4: Simplify right side
    665.01x = 369,434.52
  5. Step 5: Solve for x
    x = 369,434.52/665.01
  6. Step 6: Final answer
    x = 555.53

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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.