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Finding the Fourth Proportional to 991,502.88, 1,486,988.64 and 430,404

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Solution

The fourth proportional to 991,502.88, 1,486,988.64 and 430,404 is: 645,490.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,502.88 : 1,486,988.64 = 430,404 : x
  2. Step 2: Convert to fraction form
    991,502.88/1,486,988.64 = 430,404/x
  3. Step 3: Cross multiply
    991,502.88x = 1,486,988.64 × 430,404
  4. Step 4: Simplify right side
    991,502.88x = 640,005,858,610.56
  5. Step 5: Solve for x
    x = 640,005,858,610.56/991,502.88
  6. Step 6: Final answer
    x = 645,490.67

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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.