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Finding the Fourth Proportional to 9,985.64, 13,779.64 and 5,508.51

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Solution

The fourth proportional to 9,985.64, 13,779.64 and 5,508.51 is: 7,601.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,985.64 : 13,779.64 = 5,508.51 : x
  2. Step 2: Convert to fraction form
    9,985.64/13,779.64 = 5,508.51/x
  3. Step 3: Cross multiply
    9,985.64x = 13,779.64 × 5,508.51
  4. Step 4: Simplify right side
    9,985.64x = 75,905,371.71
  5. Step 5: Solve for x
    x = 75,905,371.71/9,985.64
  6. Step 6: Final answer
    x = 7,601.45

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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.