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Finding the Fourth Proportional to 611,921.40, 918,210.15 and 256,971.30

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Solution

The fourth proportional to 611,921.40, 918,210.15 and 256,971.30 is: 385,594.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,921.40 : 918,210.15 = 256,971.30 : x
  2. Step 2: Convert to fraction form
    611,921.40/918,210.15 = 256,971.30/x
  3. Step 3: Cross multiply
    611,921.40x = 918,210.15 × 256,971.30
  4. Step 4: Simplify right side
    611,921.40x = 235,953,655,918.70
  5. Step 5: Solve for x
    x = 235,953,655,918.70/611,921.40
  6. Step 6: Final answer
    x = 385,594.71

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Double scale
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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.