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Finding the Fourth Proportional to 11,136.74, 15,368.13 and 6,420.74

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Solution

The fourth proportional to 11,136.74, 15,368.13 and 6,420.74 is: 8,860.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,136.74 : 15,368.13 = 6,420.74 : x
  2. Step 2: Convert to fraction form
    11,136.74/15,368.13 = 6,420.74/x
  3. Step 3: Cross multiply
    11,136.74x = 15,368.13 × 6,420.74
  4. Step 4: Simplify right side
    11,136.74x = 98,674,767.02
  5. Step 5: Solve for x
    x = 98,674,767.02/11,136.74
  6. Step 6: Final answer
    x = 8,860.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.