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Finding the Fourth Proportional to 345,919.40, 518,879.10 and 286,870.40

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Solution

The fourth proportional to 345,919.40, 518,879.10 and 286,870.40 is: 430,305.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    345,919.40 : 518,879.10 = 286,870.40 : x
  2. Step 2: Convert to fraction form
    345,919.40/518,879.10 = 286,870.40/x
  3. Step 3: Cross multiply
    345,919.40x = 518,879.10 × 286,870.40
  4. Step 4: Simplify right side
    345,919.40x = 148,851,054,968.64
  5. Step 5: Solve for x
    x = 148,851,054,968.64/345,919.40
  6. Step 6: Final answer
    x = 430,305.60

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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.