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Finding the Fourth Proportional to 4,971.68, 6,860.40 and 2,875.40

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Solution

The fourth proportional to 4,971.68, 6,860.40 and 2,875.40 is: 3,967.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,971.68 : 6,860.40 = 2,875.40 : x
  2. Step 2: Convert to fraction form
    4,971.68/6,860.40 = 2,875.40/x
  3. Step 3: Cross multiply
    4,971.68x = 6,860.40 × 2,875.40
  4. Step 4: Simplify right side
    4,971.68x = 19,726,394.16
  5. Step 5: Solve for x
    x = 19,726,394.16/4,971.68
  6. Step 6: Final answer
    x = 3,967.75

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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.