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Finding the Fourth Proportional to 28,068.40, 42,005.40 and 19,320.40

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Solution

The fourth proportional to 28,068.40, 42,005.40 and 19,320.40 is: 28,913.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,068.40 : 42,005.40 = 19,320.40 : x
  2. Step 2: Convert to fraction form
    28,068.40/42,005.40 = 19,320.40/x
  3. Step 3: Cross multiply
    28,068.40x = 42,005.40 × 19,320.40
  4. Step 4: Simplify right side
    28,068.40x = 811,561,130.16
  5. Step 5: Solve for x
    x = 811,561,130.16/28,068.40
  6. Step 6: Final answer
    x = 28,913.69

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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.