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Finding the Fourth Proportional to 9,905.99, 13,671.13 and 5,430.60

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Solution

The fourth proportional to 9,905.99, 13,671.13 and 5,430.60 is: 7,494.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,905.99 : 13,671.13 = 5,430.60 : x
  2. Step 2: Convert to fraction form
    9,905.99/13,671.13 = 5,430.60/x
  3. Step 3: Cross multiply
    9,905.99x = 13,671.13 × 5,430.60
  4. Step 4: Simplify right side
    9,905.99x = 74,242,425.00
  5. Step 5: Solve for x
    x = 74,242,425.00/9,905.99
  6. Step 6: Final answer
    x = 7,494.70

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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.