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Finding the Fourth Proportional to 842.51, 1,264.67 and 478.01

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Solution

The fourth proportional to 842.51, 1,264.67 and 478.01 is: 717.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.51 : 1,264.67 = 478.01 : x
  2. Step 2: Convert to fraction form
    842.51/1,264.67 = 478.01/x
  3. Step 3: Cross multiply
    842.51x = 1,264.67 × 478.01
  4. Step 4: Simplify right side
    842.51x = 604,516.19
  5. Step 5: Solve for x
    x = 604,516.19/842.51
  6. Step 6: Final answer
    x = 717.52

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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.