Home / 85,403,742.30-128,105,613.45-81,223,364.70

Finding the Fourth Proportional to 85,403,742.30, 128,105,613.45 and 81,223,364.70

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Solution

The fourth proportional to 85,403,742.30, 128,105,613.45 and 81,223,364.70 is: 121,835,047.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403,742.30 : 128,105,613.45 = 81,223,364.70 : x
  2. Step 2: Convert to fraction form
    85,403,742.30/128,105,613.45 = 81,223,364.70/x
  3. Step 3: Cross multiply
    85,403,742.30x = 128,105,613.45 × 81,223,364.70
  4. Step 4: Simplify right side
    85,403,742.30x = 10,405,168,961,366,576
  5. Step 5: Solve for x
    x = 10,405,168,961,366,576/85,403,742.30
  6. Step 6: Final answer
    x = 121,835,047.05

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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.