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Finding the Fourth Proportional to 19,005.30, 28,495.80 and 7,916.40

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Solution

The fourth proportional to 19,005.30, 28,495.80 and 7,916.40 is: 11,869.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,005.30 : 28,495.80 = 7,916.40 : x
  2. Step 2: Convert to fraction form
    19,005.30/28,495.80 = 7,916.40/x
  3. Step 3: Cross multiply
    19,005.30x = 28,495.80 × 7,916.40
  4. Step 4: Simplify right side
    19,005.30x = 225,584,151.12
  5. Step 5: Solve for x
    x = 225,584,151.12/19,005.30
  6. Step 6: Final answer
    x = 11,869.54

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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.