Home / 390,349.36-538,657.09-218,281.50

Finding the Fourth Proportional to 390,349.36, 538,657.09 and 218,281.50

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Solution

The fourth proportional to 390,349.36, 538,657.09 and 218,281.50 is: 301,214.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,349.36 : 538,657.09 = 218,281.50 : x
  2. Step 2: Convert to fraction form
    390,349.36/538,657.09 = 218,281.50/x
  3. Step 3: Cross multiply
    390,349.36x = 538,657.09 × 218,281.50
  4. Step 4: Simplify right side
    390,349.36x = 117,578,877,590.84
  5. Step 5: Solve for x
    x = 117,578,877,590.84/390,349.36
  6. Step 6: Final answer
    x = 301,214.48

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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.