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Finding the Fourth Proportional to 648.12, 895.02 and 646.80

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Solution

The fourth proportional to 648.12, 895.02 and 646.80 is: 893.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.12 : 895.02 = 646.80 : x
  2. Step 2: Convert to fraction form
    648.12/895.02 = 646.80/x
  3. Step 3: Cross multiply
    648.12x = 895.02 × 646.80
  4. Step 4: Simplify right side
    648.12x = 578,898.94
  5. Step 5: Solve for x
    x = 578,898.94/648.12
  6. Step 6: Final answer
    x = 893.20

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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.