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Finding the Fourth Proportional to 867.42, 1,299.78 and 501.30

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Solution

The fourth proportional to 867.42, 1,299.78 and 501.30 is: 751.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.42 : 1,299.78 = 501.30 : x
  2. Step 2: Convert to fraction form
    867.42/1,299.78 = 501.30/x
  3. Step 3: Cross multiply
    867.42x = 1,299.78 × 501.30
  4. Step 4: Simplify right side
    867.42x = 651,579.71
  5. Step 5: Solve for x
    x = 651,579.71/867.42
  6. Step 6: Final answer
    x = 751.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.