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Finding the Fourth Proportional to 386,406.60, 578,832.30 and 260,435.40

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Solution

The fourth proportional to 386,406.60, 578,832.30 and 260,435.40 is: 390,129.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,406.60 : 578,832.30 = 260,435.40 : x
  2. Step 2: Convert to fraction form
    386,406.60/578,832.30 = 260,435.40/x
  3. Step 3: Cross multiply
    386,406.60x = 578,832.30 × 260,435.40
  4. Step 4: Simplify right side
    386,406.60x = 150,748,421,583.42
  5. Step 5: Solve for x
    x = 150,748,421,583.42/386,406.60
  6. Step 6: Final answer
    x = 390,129.00

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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.