Home / 85,681,616.20-128,520,929.52-20,985,981.77

Finding the Fourth Proportional to 85,681,616.20, 128,520,929.52 and 20,985,981.77

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Solution

The fourth proportional to 85,681,616.20, 128,520,929.52 and 20,985,981.77 is: 31,478,606.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,681,616.20 : 128,520,929.52 = 20,985,981.77 : x
  2. Step 2: Convert to fraction form
    85,681,616.20/128,520,929.52 = 20,985,981.77/x
  3. Step 3: Cross multiply
    85,681,616.20x = 128,520,929.52 × 20,985,981.77
  4. Step 4: Simplify right side
    85,681,616.20x = 2,697,137,884,291,477
  5. Step 5: Solve for x
    x = 2,697,137,884,291,477/85,681,616.20
  6. Step 6: Final answer
    x = 31,478,606.54

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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.