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Finding the Fourth Proportional to 678,666.70, 1,018,000.05 and 257,920.30

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Solution

The fourth proportional to 678,666.70, 1,018,000.05 and 257,920.30 is: 386,880.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,666.70 : 1,018,000.05 = 257,920.30 : x
  2. Step 2: Convert to fraction form
    678,666.70/1,018,000.05 = 257,920.30/x
  3. Step 3: Cross multiply
    678,666.70x = 1,018,000.05 × 257,920.30
  4. Step 4: Simplify right side
    678,666.70x = 262,562,878,296.02
  5. Step 5: Solve for x
    x = 262,562,878,296.02/678,666.70
  6. Step 6: Final answer
    x = 386,880.45

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Similar ratio
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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.