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Finding the Fourth Proportional to 278,688.70, 418,033.05 and 260,026.30

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Solution

The fourth proportional to 278,688.70, 418,033.05 and 260,026.30 is: 390,039.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,688.70 : 418,033.05 = 260,026.30 : x
  2. Step 2: Convert to fraction form
    278,688.70/418,033.05 = 260,026.30/x
  3. Step 3: Cross multiply
    278,688.70x = 418,033.05 × 260,026.30
  4. Step 4: Simplify right side
    278,688.70x = 108,699,587,269.22
  5. Step 5: Solve for x
    x = 108,699,587,269.22/278,688.70
  6. Step 6: Final answer
    x = 390,039.45

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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.