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Finding the Fourth Proportional to 70,390.32, 105,511.32 and 25,988.64

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Solution

The fourth proportional to 70,390.32, 105,511.32 and 25,988.64 is: 38,955.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,390.32 : 105,511.32 = 25,988.64 : x
  2. Step 2: Convert to fraction form
    70,390.32/105,511.32 = 25,988.64/x
  3. Step 3: Cross multiply
    70,390.32x = 105,511.32 × 25,988.64
  4. Step 4: Simplify right side
    70,390.32x = 2,742,095,711.40
  5. Step 5: Solve for x
    x = 2,742,095,711.40/70,390.32
  6. Step 6: Final answer
    x = 38,955.58

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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.