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Finding the Fourth Proportional to 612,128.40, 917,864.55 and 256,740.90

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Solution

The fourth proportional to 612,128.40, 917,864.55 and 256,740.90 is: 384,973.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,128.40 : 917,864.55 = 256,740.90 : x
  2. Step 2: Convert to fraction form
    612,128.40/917,864.55 = 256,740.90/x
  3. Step 3: Cross multiply
    612,128.40x = 917,864.55 × 256,740.90
  4. Step 4: Simplify right side
    612,128.40x = 235,653,370,645.10
  5. Step 5: Solve for x
    x = 235,653,370,645.10/612,128.40
  6. Step 6: Final answer
    x = 384,973.76

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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.