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Finding the Fourth Proportional to 18,767.16, 28,140.32 and 7,681.64

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Solution

The fourth proportional to 18,767.16, 28,140.32 and 7,681.64 is: 11,518.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,767.16 : 28,140.32 = 7,681.64 : x
  2. Step 2: Convert to fraction form
    18,767.16/28,140.32 = 7,681.64/x
  3. Step 3: Cross multiply
    18,767.16x = 28,140.32 × 7,681.64
  4. Step 4: Simplify right side
    18,767.16x = 216,163,807.72
  5. Step 5: Solve for x
    x = 216,163,807.72/18,767.16
  6. Step 6: Final answer
    x = 11,518.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.