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Finding the Fourth Proportional to 70,420.59, 105,690.15 and 65,987.19

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Solution

The fourth proportional to 70,420.59, 105,690.15 and 65,987.19 is: 99,036.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,420.59 : 105,690.15 = 65,987.19 : x
  2. Step 2: Convert to fraction form
    70,420.59/105,690.15 = 65,987.19/x
  3. Step 3: Cross multiply
    70,420.59x = 105,690.15 × 65,987.19
  4. Step 4: Simplify right side
    70,420.59x = 6,974,196,009.18
  5. Step 5: Solve for x
    x = 6,974,196,009.18/70,420.59
  6. Step 6: Final answer
    x = 99,036.32

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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.