Home / 1,020,921.72-1,531,383.06-421,223.76

Finding the Fourth Proportional to 1,020,921.72, 1,531,383.06 and 421,223.76

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Solution

The fourth proportional to 1,020,921.72, 1,531,383.06 and 421,223.76 is: 631,835.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020,921.72 : 1,531,383.06 = 421,223.76 : x
  2. Step 2: Convert to fraction form
    1,020,921.72/1,531,383.06 = 421,223.76/x
  3. Step 3: Cross multiply
    1,020,921.72x = 1,531,383.06 × 421,223.76
  4. Step 4: Simplify right side
    1,020,921.72x = 645,054,930,533.51
  5. Step 5: Solve for x
    x = 645,054,930,533.51/1,020,921.72
  6. Step 6: Final answer
    x = 631,835.84

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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.