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Finding the Fourth Proportional to 28,428.60, 42,642.90 and 19,097.40

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Solution

The fourth proportional to 28,428.60, 42,642.90 and 19,097.40 is: 28,646.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.60 : 42,642.90 = 19,097.40 : x
  2. Step 2: Convert to fraction form
    28,428.60/42,642.90 = 19,097.40/x
  3. Step 3: Cross multiply
    28,428.60x = 42,642.90 × 19,097.40
  4. Step 4: Simplify right side
    28,428.60x = 814,368,518.46
  5. Step 5: Solve for x
    x = 814,368,518.46/28,428.60
  6. Step 6: Final answer
    x = 28,646.10

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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.