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Finding the Fourth Proportional to 278,990.40, 385,009.23 and 151,666.20

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Solution

The fourth proportional to 278,990.40, 385,009.23 and 151,666.20 is: 209,300.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,990.40 : 385,009.23 = 151,666.20 : x
  2. Step 2: Convert to fraction form
    278,990.40/385,009.23 = 151,666.20/x
  3. Step 3: Cross multiply
    278,990.40x = 385,009.23 × 151,666.20
  4. Step 4: Simplify right side
    278,990.40x = 58,392,886,879.03
  5. Step 5: Solve for x
    x = 58,392,886,879.03/278,990.40
  6. Step 6: Final answer
    x = 209,300.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.