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Finding the Fourth Proportional to 646.95, 972.23 and 386.98

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Solution

The fourth proportional to 646.95, 972.23 and 386.98 is: 581.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.95 : 972.23 = 386.98 : x
  2. Step 2: Convert to fraction form
    646.95/972.23 = 386.98/x
  3. Step 3: Cross multiply
    646.95x = 972.23 × 386.98
  4. Step 4: Simplify right side
    646.95x = 376,233.57
  5. Step 5: Solve for x
    x = 376,233.57/646.95
  6. Step 6: Final answer
    x = 581.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.