Home / 420,109,931.70-630,164,897.55-378,498,101.40

Finding the Fourth Proportional to 420,109,931.70, 630,164,897.55 and 378,498,101.40

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Solution

The fourth proportional to 420,109,931.70, 630,164,897.55 and 378,498,101.40 is: 567,747,152.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,109,931.70 : 630,164,897.55 = 378,498,101.40 : x
  2. Step 2: Convert to fraction form
    420,109,931.70/630,164,897.55 = 378,498,101.40/x
  3. Step 3: Cross multiply
    420,109,931.70x = 630,164,897.55 × 378,498,101.40
  4. Step 4: Simplify right side
    420,109,931.70x = 238,516,217,291,600,480
  5. Step 5: Solve for x
    x = 238,516,217,291,600,480/420,109,931.70
  6. Step 6: Final answer
    x = 567,747,152.10

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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.