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Finding the Fourth Proportional to 10,602,503.80, 15,903,755.70 and 5,211,986.20

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Solution

The fourth proportional to 10,602,503.80, 15,903,755.70 and 5,211,986.20 is: 7,817,979.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,602,503.80 : 15,903,755.70 = 5,211,986.20 : x
  2. Step 2: Convert to fraction form
    10,602,503.80/15,903,755.70 = 5,211,986.20/x
  3. Step 3: Cross multiply
    10,602,503.80x = 15,903,755.70 × 5,211,986.20
  4. Step 4: Simplify right side
    10,602,503.80x = 82,890,155,236,571.34
  5. Step 5: Solve for x
    x = 82,890,155,236,571.34/10,602,503.80
  6. Step 6: Final answer
    x = 7,817,979.30

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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.