Home / 390,931.09-539,535.74-218,914.56

Finding the Fourth Proportional to 390,931.09, 539,535.74 and 218,914.56

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Solution

The fourth proportional to 390,931.09, 539,535.74 and 218,914.56 is: 302,130.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,931.09 : 539,535.74 = 218,914.56 : x
  2. Step 2: Convert to fraction form
    390,931.09/539,535.74 = 218,914.56/x
  3. Step 3: Cross multiply
    390,931.09x = 539,535.74 × 218,914.56
  4. Step 4: Simplify right side
    390,931.09x = 118,112,228,031.80
  5. Step 5: Solve for x
    x = 118,112,228,031.80/390,931.09
  6. Step 6: Final answer
    x = 302,130.56

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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.