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Finding the Fourth Proportional to 1,639, 2,261.07 and 975.47

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Solution

The fourth proportional to 1,639, 2,261.07 and 975.47 is: 1,345.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639 : 2,261.07 = 975.47 : x
  2. Step 2: Convert to fraction form
    1,639/2,261.07 = 975.47/x
  3. Step 3: Cross multiply
    1,639x = 2,261.07 × 975.47
  4. Step 4: Simplify right side
    1,639x = 2,205,605.95
  5. Step 5: Solve for x
    x = 2,205,605.95/1,639
  6. Step 6: Final answer
    x = 1,345.70

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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.