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Finding the Fourth Proportional to 15,503.95, 21,395.52 and 8,430.34

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Solution

The fourth proportional to 15,503.95, 21,395.52 and 8,430.34 is: 11,633.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,503.95 : 21,395.52 = 8,430.34 : x
  2. Step 2: Convert to fraction form
    15,503.95/21,395.52 = 8,430.34/x
  3. Step 3: Cross multiply
    15,503.95x = 21,395.52 × 8,430.34
  4. Step 4: Simplify right side
    15,503.95x = 180,371,508.08
  5. Step 5: Solve for x
    x = 180,371,508.08/15,503.95
  6. Step 6: Final answer
    x = 11,633.91

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Half scale
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Double scale
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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.