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Finding the Fourth Proportional to 910.79, 1,365.12 and 391.08

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Solution

The fourth proportional to 910.79, 1,365.12 and 391.08 is: 586.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.79 : 1,365.12 = 391.08 : x
  2. Step 2: Convert to fraction form
    910.79/1,365.12 = 391.08/x
  3. Step 3: Cross multiply
    910.79x = 1,365.12 × 391.08
  4. Step 4: Simplify right side
    910.79x = 533,865.28
  5. Step 5: Solve for x
    x = 533,865.28/910.79
  6. Step 6: Final answer
    x = 586.15

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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.