Home / 85,403,875.80-128,105,813.70-81,223,498.20

Finding the Fourth Proportional to 85,403,875.80, 128,105,813.70 and 81,223,498.20

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Solution

The fourth proportional to 85,403,875.80, 128,105,813.70 and 81,223,498.20 is: 121,835,247.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403,875.80 : 128,105,813.70 = 81,223,498.20 : x
  2. Step 2: Convert to fraction form
    85,403,875.80/128,105,813.70 = 81,223,498.20/x
  3. Step 3: Cross multiply
    85,403,875.80x = 128,105,813.70 × 81,223,498.20
  4. Step 4: Simplify right side
    85,403,875.80x = 10,405,202,328,471,486
  5. Step 5: Solve for x
    x = 10,405,202,328,471,486/85,403,875.80
  6. Step 6: Final answer
    x = 121,835,247.30

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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.