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Finding the Fourth Proportional to 753.15, 1,038.25 and 647.79

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Solution

The fourth proportional to 753.15, 1,038.25 and 647.79 is: 893.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.15 : 1,038.25 = 647.79 : x
  2. Step 2: Convert to fraction form
    753.15/1,038.25 = 647.79/x
  3. Step 3: Cross multiply
    753.15x = 1,038.25 × 647.79
  4. Step 4: Simplify right side
    753.15x = 672,567.97
  5. Step 5: Solve for x
    x = 672,567.97/753.15
  6. Step 6: Final answer
    x = 893.01

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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.