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Finding the Fourth Proportional to 85,800,645.20, 128,700,967.80 and 85,800,645.20

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Solution

The fourth proportional to 85,800,645.20, 128,700,967.80 and 85,800,645.20 is: 128,700,967.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,800,645.20 : 128,700,967.80 = 85,800,645.20 : x
  2. Step 2: Convert to fraction form
    85,800,645.20/128,700,967.80 = 85,800,645.20/x
  3. Step 3: Cross multiply
    85,800,645.20x = 128,700,967.80 × 85,800,645.20
  4. Step 4: Simplify right side
    85,800,645.20x = 11,042,626,075,104,424
  5. Step 5: Solve for x
    x = 11,042,626,075,104,424/85,800,645.20
  6. Step 6: Final answer
    x = 128,700,967.80

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1.5x scale

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.