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Finding the Fourth Proportional to 915.77, 1,263.95 and 621.13

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Solution

The fourth proportional to 915.77, 1,263.95 and 621.13 is: 857.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.77 : 1,263.95 = 621.13 : x
  2. Step 2: Convert to fraction form
    915.77/1,263.95 = 621.13/x
  3. Step 3: Cross multiply
    915.77x = 1,263.95 × 621.13
  4. Step 4: Simplify right side
    915.77x = 785,077.26
  5. Step 5: Solve for x
    x = 785,077.26/915.77
  6. Step 6: Final answer
    x = 857.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.