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Finding the Fourth Proportional to 328,136.30, 492,058.65 and 128,390.30

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Solution

The fourth proportional to 328,136.30, 492,058.65 and 128,390.30 is: 192,528.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,136.30 : 492,058.65 = 128,390.30 : x
  2. Step 2: Convert to fraction form
    328,136.30/492,058.65 = 128,390.30/x
  3. Step 3: Cross multiply
    328,136.30x = 492,058.65 × 128,390.30
  4. Step 4: Simplify right side
    328,136.30x = 63,175,557,691.10
  5. Step 5: Solve for x
    x = 63,175,557,691.10/328,136.30
  6. Step 6: Final answer
    x = 192,528.40

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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.