Home / 427,103,999.40-640,655,999.10-386,289,330.60

Finding the Fourth Proportional to 427,103,999.40, 640,655,999.10 and 386,289,330.60

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Solution

The fourth proportional to 427,103,999.40, 640,655,999.10 and 386,289,330.60 is: 579,433,995.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,103,999.40 : 640,655,999.10 = 386,289,330.60 : x
  2. Step 2: Convert to fraction form
    427,103,999.40/640,655,999.10 = 386,289,330.60/x
  3. Step 3: Cross multiply
    427,103,999.40x = 640,655,999.10 × 386,289,330.60
  4. Step 4: Simplify right side
    427,103,999.40x = 247,478,577,037,213,216
  5. Step 5: Solve for x
    x = 247,478,577,037,213,216/427,103,999.40
  6. Step 6: Final answer
    x = 579,433,995.90

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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.