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Finding the Fourth Proportional to 678,751.60, 1,018,127.40 and 647,647.60

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Solution

The fourth proportional to 678,751.60, 1,018,127.40 and 647,647.60 is: 971,471.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,751.60 : 1,018,127.40 = 647,647.60 : x
  2. Step 2: Convert to fraction form
    678,751.60/1,018,127.40 = 647,647.60/x
  3. Step 3: Cross multiply
    678,751.60x = 1,018,127.40 × 647,647.60
  4. Step 4: Simplify right side
    678,751.60x = 659,387,767,104.24
  5. Step 5: Solve for x
    x = 659,387,767,104.24/678,751.60
  6. Step 6: Final answer
    x = 971,471.40

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Double scale
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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.