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Finding the Fourth Proportional to 611,920.40, 918,208.65 and 256,970.30

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Solution

The fourth proportional to 611,920.40, 918,208.65 and 256,970.30 is: 385,593.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,920.40 : 918,208.65 = 256,970.30 : x
  2. Step 2: Convert to fraction form
    611,920.40/918,208.65 = 256,970.30/x
  3. Step 3: Cross multiply
    611,920.40x = 918,208.65 × 256,970.30
  4. Step 4: Simplify right side
    611,920.40x = 235,952,352,253.10
  5. Step 5: Solve for x
    x = 235,952,352,253.10/611,920.40
  6. Step 6: Final answer
    x = 385,593.21

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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.