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Finding the Fourth Proportional to 915.07, 1,365.95 and 847.39

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Solution

The fourth proportional to 915.07, 1,365.95 and 847.39 is: 1,264.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.07 : 1,365.95 = 847.39 : x
  2. Step 2: Convert to fraction form
    915.07/1,365.95 = 847.39/x
  3. Step 3: Cross multiply
    915.07x = 1,365.95 × 847.39
  4. Step 4: Simplify right side
    915.07x = 1,157,492.37
  5. Step 5: Solve for x
    x = 1,157,492.37/915.07
  6. Step 6: Final answer
    x = 1,264.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.