Home / 85,681,617.71-128,520,931.77-20,985,983.28

Finding the Fourth Proportional to 85,681,617.71, 128,520,931.77 and 20,985,983.28

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Solution

The fourth proportional to 85,681,617.71, 128,520,931.77 and 20,985,983.28 is: 31,478,608.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,681,617.71 : 128,520,931.77 = 20,985,983.28 : x
  2. Step 2: Convert to fraction form
    85,681,617.71/128,520,931.77 = 20,985,983.28/x
  3. Step 3: Cross multiply
    85,681,617.71x = 128,520,931.77 × 20,985,983.28
  4. Step 4: Simplify right side
    85,681,617.71x = 2,697,138,125,255,241
  5. Step 5: Solve for x
    x = 2,697,138,125,255,241/85,681,617.71
  6. Step 6: Final answer
    x = 31,478,608.80

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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.