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Finding the Fourth Proportional to 70,235.60, 105,302.20 and 28,661.20

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Solution

The fourth proportional to 70,235.60, 105,302.20 and 28,661.20 is: 42,970.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,235.60 : 105,302.20 = 28,661.20 : x
  2. Step 2: Convert to fraction form
    70,235.60/105,302.20 = 28,661.20/x
  3. Step 3: Cross multiply
    70,235.60x = 105,302.20 × 28,661.20
  4. Step 4: Simplify right side
    70,235.60x = 3,018,087,414.64
  5. Step 5: Solve for x
    x = 3,018,087,414.64/70,235.60
  6. Step 6: Final answer
    x = 42,970.91

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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.