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Finding the Fourth Proportional to 328,547.40, 492,723.90 and 128,752.80

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Solution

The fourth proportional to 328,547.40, 492,723.90 and 128,752.80 is: 193,091.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,547.40 : 492,723.90 = 128,752.80 : x
  2. Step 2: Convert to fraction form
    328,547.40/492,723.90 = 128,752.80/x
  3. Step 3: Cross multiply
    328,547.40x = 492,723.90 × 128,752.80
  4. Step 4: Simplify right side
    328,547.40x = 63,439,581,751.92
  5. Step 5: Solve for x
    x = 63,439,581,751.92/328,547.40
  6. Step 6: Final answer
    x = 193,091.11

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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.