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Finding the Fourth Proportional to 260,657.80, 390,908.70 and 135,930.76

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Solution

The fourth proportional to 260,657.80, 390,908.70 and 135,930.76 is: 203,855.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,657.80 : 390,908.70 = 135,930.76 : x
  2. Step 2: Convert to fraction form
    260,657.80/390,908.70 = 135,930.76/x
  3. Step 3: Cross multiply
    260,657.80x = 390,908.70 × 135,930.76
  4. Step 4: Simplify right side
    260,657.80x = 53,136,516,681.61
  5. Step 5: Solve for x
    x = 53,136,516,681.61/260,657.80
  6. Step 6: Final answer
    x = 203,855.46

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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.