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Finding the Fourth Proportional to 1,085.32, 1,627.80 and 435.70

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Solution

The fourth proportional to 1,085.32, 1,627.80 and 435.70 is: 653.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.32 : 1,627.80 = 435.70 : x
  2. Step 2: Convert to fraction form
    1,085.32/1,627.80 = 435.70/x
  3. Step 3: Cross multiply
    1,085.32x = 1,627.80 × 435.70
  4. Step 4: Simplify right side
    1,085.32x = 709,232.46
  5. Step 5: Solve for x
    x = 709,232.46/1,085.32
  6. Step 6: Final answer
    x = 653.48

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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.