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Finding the Fourth Proportional to 103,689.40, 155,534.10 and 28,809.40

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Solution

The fourth proportional to 103,689.40, 155,534.10 and 28,809.40 is: 43,214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689.40 : 155,534.10 = 28,809.40 : x
  2. Step 2: Convert to fraction form
    103,689.40/155,534.10 = 28,809.40/x
  3. Step 3: Cross multiply
    103,689.40x = 155,534.10 × 28,809.40
  4. Step 4: Simplify right side
    103,689.40x = 4,480,844,100.54
  5. Step 5: Solve for x
    x = 4,480,844,100.54/103,689.40
  6. Step 6: Final answer
    x = 43,214.10

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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.