Home / 390,883.32-539,445.06-218,816.55

Finding the Fourth Proportional to 390,883.32, 539,445.06 and 218,816.55

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Solution

The fourth proportional to 390,883.32, 539,445.06 and 218,816.55 is: 301,981.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,883.32 : 539,445.06 = 218,816.55 : x
  2. Step 2: Convert to fraction form
    390,883.32/539,445.06 = 218,816.55/x
  3. Step 3: Cross multiply
    390,883.32x = 539,445.06 × 218,816.55
  4. Step 4: Simplify right side
    390,883.32x = 118,039,506,943.74
  5. Step 5: Solve for x
    x = 118,039,506,943.74/390,883.32
  6. Step 6: Final answer
    x = 301,981.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.