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Finding the Fourth Proportional to 1,326.08, 1,989.40 and 460.40

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Solution

The fourth proportional to 1,326.08, 1,989.40 and 460.40 is: 690.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.08 : 1,989.40 = 460.40 : x
  2. Step 2: Convert to fraction form
    1,326.08/1,989.40 = 460.40/x
  3. Step 3: Cross multiply
    1,326.08x = 1,989.40 × 460.40
  4. Step 4: Simplify right side
    1,326.08x = 915,919.76
  5. Step 5: Solve for x
    x = 915,919.76/1,326.08
  6. Step 6: Final answer
    x = 690.70

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1.5x scale

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.