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Finding the Fourth Proportional to 1,432.99, 1,977.84 and 985.45

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Solution

The fourth proportional to 1,432.99, 1,977.84 and 985.45 is: 1,360.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.99 : 1,977.84 = 985.45 : x
  2. Step 2: Convert to fraction form
    1,432.99/1,977.84 = 985.45/x
  3. Step 3: Cross multiply
    1,432.99x = 1,977.84 × 985.45
  4. Step 4: Simplify right side
    1,432.99x = 1,949,062.43
  5. Step 5: Solve for x
    x = 1,949,062.43/1,432.99
  6. Step 6: Final answer
    x = 1,360.14

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1.5x scale

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.