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Finding the Fourth Proportional to 9,985, 13,779.36 and 5,508.91

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Solution

The fourth proportional to 9,985, 13,779.36 and 5,508.91 is: 7,602.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,985 : 13,779.36 = 5,508.91 : x
  2. Step 2: Convert to fraction form
    9,985/13,779.36 = 5,508.91/x
  3. Step 3: Cross multiply
    9,985x = 13,779.36 × 5,508.91
  4. Step 4: Simplify right side
    9,985x = 75,909,254.10
  5. Step 5: Solve for x
    x = 75,909,254.10/9,985
  6. Step 6: Final answer
    x = 7,602.33

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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.