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Finding the Fourth Proportional to 612,312.40, 918,614.40 and 257,143.60

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Solution

The fourth proportional to 612,312.40, 918,614.40 and 257,143.60 is: 385,776.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,312.40 : 918,614.40 = 257,143.60 : x
  2. Step 2: Convert to fraction form
    612,312.40/918,614.40 = 257,143.60/x
  3. Step 3: Cross multiply
    612,312.40x = 918,614.40 × 257,143.60
  4. Step 4: Simplify right side
    612,312.40x = 236,215,813,827.84
  5. Step 5: Solve for x
    x = 236,215,813,827.84/612,312.40
  6. Step 6: Final answer
    x = 385,776.63

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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.