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Finding the Fourth Proportional to 9,870.12, 13,603.68 and 8,603.28

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Solution

The fourth proportional to 9,870.12, 13,603.68 and 8,603.28 is: 11,857.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,870.12 : 13,603.68 = 8,603.28 : x
  2. Step 2: Convert to fraction form
    9,870.12/13,603.68 = 8,603.28/x
  3. Step 3: Cross multiply
    9,870.12x = 13,603.68 × 8,603.28
  4. Step 4: Simplify right side
    9,870.12x = 117,036,268.07
  5. Step 5: Solve for x
    x = 117,036,268.07/9,870.12
  6. Step 6: Final answer
    x = 11,857.63

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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.