Finding the Fourth Proportional to 390,472,292.40, 585,296,645.94 and 128,088,328.20
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Solution
The fourth proportional to 390,472,292.40, 585,296,645.94 and 128,088,328.20 is: 191,997,410.16
Step by Step Solution
- Step 1: Write the proportion equation
390,472,292.40 : 585,296,645.94 = 128,088,328.20 : x - Step 2: Convert to fraction form
390,472,292.40/585,296,645.94 = 128,088,328.20/x - Step 3: Cross multiply
390,472,292.40x = 585,296,645.94 × 128,088,328.20 - Step 4: Simplify right side
390,472,292.40x = 74,969,668,879,521,920 - Step 5: Solve for x
x = 74,969,668,879,521,920/390,472,292.40 - Step 6: Final answer
x = 191,997,410.16
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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.