Home / 390,482.06-538,854.46-218,400.35

Finding the Fourth Proportional to 390,482.06, 538,854.46 and 218,400.35

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Solution

The fourth proportional to 390,482.06, 538,854.46 and 218,400.35 is: 301,386.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,482.06 : 538,854.46 = 218,400.35 : x
  2. Step 2: Convert to fraction form
    390,482.06/538,854.46 = 218,400.35/x
  3. Step 3: Cross multiply
    390,482.06x = 538,854.46 × 218,400.35
  4. Step 4: Simplify right side
    390,482.06x = 117,685,999,422.79
  5. Step 5: Solve for x
    x = 117,685,999,422.79/390,482.06
  6. Step 6: Final answer
    x = 301,386.45

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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.