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Finding the Fourth Proportional to 30,281.65, 42,438.05 and 30,281.65

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Solution

The fourth proportional to 30,281.65, 42,438.05 and 30,281.65 is: 42,438.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,281.65 : 42,438.05 = 30,281.65 : x
  2. Step 2: Convert to fraction form
    30,281.65/42,438.05 = 30,281.65/x
  3. Step 3: Cross multiply
    30,281.65x = 42,438.05 × 30,281.65
  4. Step 4: Simplify right side
    30,281.65x = 1,285,094,176.78
  5. Step 5: Solve for x
    x = 1,285,094,176.78/30,281.65
  6. Step 6: Final answer
    x = 42,438.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.