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Finding the Fourth Proportional to 385,411.60, 577,339.80 and 259,440.40

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Solution

The fourth proportional to 385,411.60, 577,339.80 and 259,440.40 is: 388,637.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,411.60 : 577,339.80 = 259,440.40 : x
  2. Step 2: Convert to fraction form
    385,411.60/577,339.80 = 259,440.40/x
  3. Step 3: Cross multiply
    385,411.60x = 577,339.80 × 259,440.40
  4. Step 4: Simplify right side
    385,411.60x = 149,785,268,647.92
  5. Step 5: Solve for x
    x = 149,785,268,647.92/385,411.60
  6. Step 6: Final answer
    x = 388,637.16

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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.