Home / 1,442.73-1,989.95-1,421.13

Finding the Fourth Proportional to 1,442.73, 1,989.95 and 1,421.13

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Solution

The fourth proportional to 1,442.73, 1,989.95 and 1,421.13 is: 1,960.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.73 : 1,989.95 = 1,421.13 : x
  2. Step 2: Convert to fraction form
    1,442.73/1,989.95 = 1,421.13/x
  3. Step 3: Cross multiply
    1,442.73x = 1,989.95 × 1,421.13
  4. Step 4: Simplify right side
    1,442.73x = 2,827,970.54
  5. Step 5: Solve for x
    x = 2,827,970.54/1,442.73
  6. Step 6: Final answer
    x = 1,960.15

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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.