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Finding the Fourth Proportional to 612,129.90, 917,866.80 and 256,742.40

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Solution

The fourth proportional to 612,129.90, 917,866.80 and 256,742.40 is: 384,976.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,129.90 : 917,866.80 = 256,742.40 : x
  2. Step 2: Convert to fraction form
    612,129.90/917,866.80 = 256,742.40/x
  3. Step 3: Cross multiply
    612,129.90x = 917,866.80 × 256,742.40
  4. Step 4: Simplify right side
    612,129.90x = 235,655,325,112.32
  5. Step 5: Solve for x
    x = 235,655,325,112.32/612,129.90
  6. Step 6: Final answer
    x = 384,976.01

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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.