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Finding the Fourth Proportional to 153,978.40, 215,880.80 and 153,978.40

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Solution

The fourth proportional to 153,978.40, 215,880.80 and 153,978.40 is: 215,880.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,978.40 : 215,880.80 = 153,978.40 : x
  2. Step 2: Convert to fraction form
    153,978.40/215,880.80 = 153,978.40/x
  3. Step 3: Cross multiply
    153,978.40x = 215,880.80 × 153,978.40
  4. Step 4: Simplify right side
    153,978.40x = 33,240,980,174.72
  5. Step 5: Solve for x
    x = 33,240,980,174.72/153,978.40
  6. Step 6: Final answer
    x = 215,880.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.