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Finding the Fourth Proportional to 328,545.40, 492,720.90 and 128,750.80

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Solution

The fourth proportional to 328,545.40, 492,720.90 and 128,750.80 is: 193,088.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,545.40 : 492,720.90 = 128,750.80 : x
  2. Step 2: Convert to fraction form
    328,545.40/492,720.90 = 128,750.80/x
  3. Step 3: Cross multiply
    328,545.40x = 492,720.90 × 128,750.80
  4. Step 4: Simplify right side
    328,545.40x = 63,438,210,051.72
  5. Step 5: Solve for x
    x = 63,438,210,051.72/328,545.40
  6. Step 6: Final answer
    x = 193,088.11

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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.