Home / 85,965,325.80-128,947,988.70-78,029,140.20

Finding the Fourth Proportional to 85,965,325.80, 128,947,988.70 and 78,029,140.20

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Solution

The fourth proportional to 85,965,325.80, 128,947,988.70 and 78,029,140.20 is: 117,043,710.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,965,325.80 : 128,947,988.70 = 78,029,140.20 : x
  2. Step 2: Convert to fraction form
    85,965,325.80/128,947,988.70 = 78,029,140.20/x
  3. Step 3: Cross multiply
    85,965,325.80x = 128,947,988.70 × 78,029,140.20
  4. Step 4: Simplify right side
    85,965,325.80x = 10,061,700,688,780,316
  5. Step 5: Solve for x
    x = 10,061,700,688,780,316/85,965,325.80
  6. Step 6: Final answer
    x = 117,043,710.30

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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.