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Finding the Fourth Proportional to 70,439.16, 105,619.86 and 28,915.32

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Solution

The fourth proportional to 70,439.16, 105,619.86 and 28,915.32 is: 43,357.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,439.16 : 105,619.86 = 28,915.32 : x
  2. Step 2: Convert to fraction form
    70,439.16/105,619.86 = 28,915.32/x
  3. Step 3: Cross multiply
    70,439.16x = 105,619.86 × 28,915.32
  4. Step 4: Simplify right side
    70,439.16x = 3,054,032,050.26
  5. Step 5: Solve for x
    x = 3,054,032,050.26/70,439.16
  6. Step 6: Final answer
    x = 43,357.02

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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.