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Finding the Fourth Proportional to 916.02, 1,264.02 and 621.30

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Solution

The fourth proportional to 916.02, 1,264.02 and 621.30 is: 857.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.02 : 1,264.02 = 621.30 : x
  2. Step 2: Convert to fraction form
    916.02/1,264.02 = 621.30/x
  3. Step 3: Cross multiply
    916.02x = 1,264.02 × 621.30
  4. Step 4: Simplify right side
    916.02x = 785,335.63
  5. Step 5: Solve for x
    x = 785,335.63/916.02
  6. Step 6: Final answer
    x = 857.33

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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.