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Finding the Fourth Proportional to 140,285.80, 210,428.70 and 70,139.80

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Solution

The fourth proportional to 140,285.80, 210,428.70 and 70,139.80 is: 105,209.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,285.80 : 210,428.70 = 70,139.80 : x
  2. Step 2: Convert to fraction form
    140,285.80/210,428.70 = 70,139.80/x
  3. Step 3: Cross multiply
    140,285.80x = 210,428.70 × 70,139.80
  4. Step 4: Simplify right side
    140,285.80x = 14,759,426,932.26
  5. Step 5: Solve for x
    x = 14,759,426,932.26/140,285.80
  6. Step 6: Final answer
    x = 105,209.70

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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.