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Finding the Fourth Proportional to 555.19, 831.70 and 478.15

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Solution

The fourth proportional to 555.19, 831.70 and 478.15 is: 716.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.19 : 831.70 = 478.15 : x
  2. Step 2: Convert to fraction form
    555.19/831.70 = 478.15/x
  3. Step 3: Cross multiply
    555.19x = 831.70 × 478.15
  4. Step 4: Simplify right side
    555.19x = 397,677.36
  5. Step 5: Solve for x
    x = 397,677.36/555.19
  6. Step 6: Final answer
    x = 716.29

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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.