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Finding the Fourth Proportional to 191,915.80, 288,132.90 and 121,931.80

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Solution

The fourth proportional to 191,915.80, 288,132.90 and 121,931.80 is: 183,062.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,915.80 : 288,132.90 = 121,931.80 : x
  2. Step 2: Convert to fraction form
    191,915.80/288,132.90 = 121,931.80/x
  3. Step 3: Cross multiply
    191,915.80x = 288,132.90 × 121,931.80
  4. Step 4: Simplify right side
    191,915.80x = 35,132,563,136.22
  5. Step 5: Solve for x
    x = 35,132,563,136.22/191,915.80
  6. Step 6: Final answer
    x = 183,062.38

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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.