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Finding the Fourth Proportional to 612,216.60, 918,762.30 and 257,485.20

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Solution

The fourth proportional to 612,216.60, 918,762.30 and 257,485.20 is: 386,411.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,216.60 : 918,762.30 = 257,485.20 : x
  2. Step 2: Convert to fraction form
    612,216.60/918,762.30 = 257,485.20/x
  3. Step 3: Cross multiply
    612,216.60x = 918,762.30 × 257,485.20
  4. Step 4: Simplify right side
    612,216.60x = 236,567,694,567.96
  5. Step 5: Solve for x
    x = 236,567,694,567.96/612,216.60
  6. Step 6: Final answer
    x = 386,411.76

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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.